Generic paged cache for Go maps (Go version 1.19)

caching.go

package caching

type pagedMapCacheKey struct {
	key 		int
	page_number int
	page_size 	int
}

const enable_caching bool = false

type pagedMap[V any] map[pagedMapCacheKey]*V

var paged_cache interface{}

func GetCacheValuePaged[V any](key int, page_number int, page_size int) *V {
	if !enable_caching {
		return nil
	}

	if paged_cache == nil {
		return nil
	}

	vMap, _ := paged_cache.(pagedMap[V])
	if vMap != nil {
		return vMap[pagedMapCacheKey{key, page_number, page_size}]
	} else {
		return nil
	}
}

func SetCacheValue[V any](key int, page_number int, page_size int, value *V) {
	
	if paged_cache == nil {
		paged_cache = make(pagedMap[V])
	}

	vMap, _ := paged_cache.(pagedMap[V])
	if vMap != nil {
		vMap[pagedMapCacheKey{key, page_number, page_size}] = value
	}
}